Dwarf Neon Rainbowfish
Melanotaenia praecox
Melanotaeniidae
FishDifficulty: ●●○○○Data: well-established
About
The dwarf neon rainbowfish is a compact, shimmering member of the rainbowfish family, endemic to the Mamberamo River system of northern West Papua, New Guinea. Males glow an electric neon blue with fiery red-orange fins, while females stay silvery with yellowish fins, and both intensify in colour when displaying. It is an active, peaceful open-water shoaler that reaches around 6 to 7 cm and shows its best colours and behaviour in a well-planted, roomy tank kept in a decent-sized group.
Care
Keep a shoal of 6+ (ideally with more females than males) in a long, planted tank of 90 L or more, with a secure lid, some flow and open swimming space. Hardy but appreciates clean, well-oxygenated water and prefers neutral to slightly hard conditions.
Diet
Eager, unfussy omnivore. Feed varied dry foods daily and supplement often with frozen or live daphnia, cyclops, bloodworm and brine shrimp for peak colour.
Tankmate compatibility
Gets along with (61)
Agassiz's CoryAmano ShrimpAssassin SnailBamboo ShrimpBanjo CatfishBlood Parrot CichlidBloodfin TetraBlue Velvet ShrimpBoesemani RainbowfishBolivian RamBrichard's TeleogrammaBristlenose PlecoBronze CorydorasCherry ShrimpChinese Algae EaterClown PlecoDwarf Chain LoachDwarf GouramiDwarf Orange CrayfishDwarf Pea PufferElephantnose FishEmerald CoryForktail RainbowfishFreshwater ClamGhost ShrimpGlass CatfishGolden Wonder KillifishGuppyHoney GouramiJulii CoryKribensisMalaysian Trumpet SnailMystery SnailOtocinclusPearl GouramiPenguin TetraPictus CatfishPlatyPolka Dot LoachRainbow SharkRamshorn SnailRed Whiptail CatfishRed-Tail SharkSalt and Pepper CoryScarlet BadisScissortail RasboraSiamese Algae EaterSilver Tip TetraSterbai CorydorasT-Bar CichlidThai Micro CrabThick-lipped GouramiThreadfin RainbowfishThree-spot GouramiTiger BarbUpside-down CatfishVampire ShrimpVenezuelan CoryWrestling HalfbeakX-ray TetraYoyo Loach
Possible with care (156)
Acei CichlidAfrican Butterfly CichlidAfrican ButterflyfishAgassiz's Dwarf CichlidAngelfishAuratus CichlidBetta (Siamese Fighting Fish)Black Neon TetraBlack Phantom TetraBlack Ruby BarbBlack Skirt TetraBlackline RasboraBladder SnailBleeding Heart TetraBlue AcaraBlue Dolphin CichlidBlue Tiger ShrimpBorleyi (Redfin Hap)Borneo SuckerBrevis Shell DwellerBrichardi (Fairy Cichlid)Buenos Aires TetraBuffalohead CichlidBumblebee CichlidBumblebee GobyButterfly Hillstream LoachCalvus CichlidCelebes RainbowfishCelestial Pearl DanioCheckerboard CichlidCheckered BarbCherry BarbChili RasboraChocolate CichlidClown KillifishCobalt Blue ZebraCochu's Blue TetraCockatoo Dwarf CichlidColombian Ramshorn SnailCongo Dwarf CichlidCongo TetraConvict CichlidCylindricus CichlidCyprichromisDemasoni CichlidDenison BarbDiamond TetraDiscusDoctor FishDogtooth CichlidDojo (Weather) LoachDwarf Flag CichlidDwarf Petricola CatfishDwarf RasboraElectric Blue AhliElectric Yellow LabEllioti CichlidElongate MbunaEmber TetraEmperor TetraEndler's LivebearerEven-spotted SynodontisFeatherfin SqueakerFestivum (Flag Cichlid)Figure-8 PufferFiremouth CichlidFive-bar CichlidFlame TetraGerman Blue RamGlowlight DanioGlowlight TetraGold BarbGolden Dwarf CichlidGolden JulieGolden PencilfishGolden TetraGreen DiscusGreen Neon TetraHarlequin RasboraHead-and-Tail-Light TetraHongi CichlidJack DempseyJapanese Trapdoor SnailJewel CichlidJohanni CichlidKenyi CichlidKeyhole CichlidKissing GouramiKuhli LoachLambchop RasboraLeast KillifishLemon CichlidLemon TetraLeopard DanioLittle CorydorasMacmasteri Dwarf CichlidMaingano CichlidMarble HatchetfishMarlieri CichlidMedaka RicefishMoonlight GouramiMultifasciatus Shell DwellerNeon TetraNerite SnailOcellatus Shell DwellerOdessa BarbPanda CorydorasParadise FishParaguay EartheaterPeaceful BettaPeacock CichlidPearl DanioPeppered CorydorasPort CichlidPowder Blue CichlidPurple Emperor TetraPygmy CorydorasRabbit SnailRainbow CichlidRed EmpressRed RainbowfishRed Zebra CichlidRedhead CichlidRegan's JulieReticulated Hillstream LoachRosy BarbRosy TetraRubber Lip PlecoRummynose TetraRusty CichlidSalvini CichlidSand-sifting XenotilapiaSaulosi CichlidSerpae TetraSeverumSimilis Shell DwellerSkunk CorySparkling GouramiSpotted HoploStar SapphireStrawberry RasboraStriped KribensisSulawesi Cardinal ShrimpSunshine PeacockSveni EartheaterSwordtailTaiwan Reef CichlidThreadfin AcaraThreadfin PetrochromisTurquoise RainbowfishUaru (Triangle Cichlid)Umbrella Dwarf CichlidWhite Cloud Mountain MinnowZebra DanioZebra MbunaZebra Pleco
Avoid (54)
Adonis PlecoAltum AngelfishBala SharkBlack Moor GoldfishCardinal TetraChocolate GouramiClown LoachComet GoldfishCommon GoldfishCommon PlecoCompressiceps CichlidCrystal Red ShrimpCuckoo CatfishDemon EartheaterDuboisi TropheusEndlicheri BichirFantail GoldfishFrontosaGoby CichlidGreen Spotted PufferfishGreen TerrorHeckel DiscusIridescent SharkJaguar CichlidKoiLivingstoniMalawi EyebiterMalawi HawkMasked JulieMollyOranda GoldfishOrnate BichirOscarPeacock BassPike CichlidRanchu GoldfishRed DevilRed TerrorReticulated Flying FoxRostratusRosy Red MinnowRoyal PlecoRyukin GoldfishSailfin MollySailfin PlecoShubunkin GoldfishSilver ArowanaSilver MoonyStriped Raphael CatfishTelescope GoldfishTexas CichlidTropheusVenustus (Giraffe Cichlid)Wolf Cichlid
Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.
Telling males from females
What works for this species, most reliable first.
- Colour and patternStrong · from about 6 months, and only on a settled fish
In rainbowfish, killifish and several barbs the male carries the colour — deeper and more saturated, intensifying further when he displays.
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Frequently asked questions
- What tank size does a Dwarf Neon Rainbowfish need?
- A Dwarf Neon Rainbowfish needs an aquarium of at least 90 litres (23.8 US gallons) with a footprint at least 80 cm (31.5 in) long — for this species, swimming length matters as much as raw volume.
- What water parameters does a Dwarf Neon Rainbowfish need?
- Dwarf Neon Rainbowfish does best at 22–28 °C (71.6–82.4 °F), pH 6.5–8 and a general hardness of 5–15 °dGH.
- What group size does a Dwarf Neon Rainbowfish need?
- Dwarf Neon Rainbowfish is a social species — keep a group of at least 6 so natural behaviour emerges and stress stays low.
- Is the Dwarf Neon Rainbowfish suitable for beginners?
- Yes — Dwarf Neon Rainbowfish is one of the easier species to keep and forgives typical first-tank mistakes, as long as the aquarium is cycled and maintained.
Sources
Water & tank
Temperature22–28°C
Optimal temp.24–26°C
pH6.5–8
Hardness (GH)5–15°d
Carbonate (KH)2–10°d
Adult size8 cm
Min. volume≥ 90 L
Min. tank length≥ 80 cm
Group size≥ 6
Swimming zoneMid
TemperamentPeaceful
Water typeFreshwater
FlowModerate
Lifespan~5 yrs
Try in the calculator